Sponge provides financial infrastructure for the agent economy, enabling autonomous AI agents to hold and spend money through bank accounts, cards, and cryptocurrency. The platform also lets businesses accept payments from agents without human interaction. The founding team are all alumni of Stripe's crypto team. Sponge is part of Y Combinator's Winter 2026 batch.
Sponge
ActiveFinancial infrastructure for the agent economy
Total raised
$500K
1 round
Stage
Seed
Jan 2026
Team
1-10
since 2026
Pricing
—
Founded
2026
San Francisco, United States
Agent-ready
—
Financial infrastructure for the agent economy
Lets AI agents hold and spend money
Support for bank accounts as an agent funding source
Card-based spending for agents
Cryptocurrency support for agent transactions
Lets businesses accept payments from agents without human involvement
Built by alumni of Stripe's crypto team
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Jan 2026 Seed $500K ● Y Combinator
Capital network
$500K raised ·1 backer·10 network links
- Backers1
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
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- What does Sponge enable agents to do?
- It lets autonomous AI agents hold and spend money through bank accounts, cards, and cryptocurrency.
- How does Sponge help businesses?
- It lets businesses accept payments from AI agents without requiring human interaction in the transaction.
- Which payment methods does it support?
- It supports bank accounts, cards, and cryptocurrency for agent transactions.
- Who built Sponge?
- The founding team are all alumni of Stripe's crypto team.
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